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LOS ANGELES — Elon Musk unveiled his underground transportation tunnel on Tuesday, allowing reporters and invited guests to take some of the first rides in the revolutionary albeit bumpy subterranean tube — the tech entrepreneur's answer to what he calls "soul-destroying traffic."

Guests, including seven Chicago alderman, boarded Musk's Tesla Model S and rode along Los Angeles-area surface streets about a mile away to what's known as O'Leary Station. The station, smack dab in the middle of a residential neighborhood — "basically in someone's backyard," Musk says — consists of a wall-less elevator that slowly took the car down a wide shaft, roughly 30 feet below the surface.

The sky slowly fell away and the surprisingly narrow tunnel emerged.

"We're clear," said the driver, who sped up and zipped into the tunnel when a red track light turned green, making the tube look like something from space or a dance club.

The car jostled significantly during the ride, which was bumpy enough to give one reporter motion sickness while another yelled, "Woo!"

Musk described his first ride as "epic."

"For me it was a eureka moment," he told a room full of reporters. "I was like, 'This thing is going to damn well work.'"

He said the rides are bumpy now because "we kind of ran out of time" and there were some problems with the speed of his paving machine.

"It'll be smooth as glass," he said of future systems. "This is just a prototype. That's why it's a little rough around the edges."

The demo rides were also considerably slower — 40 mph — than what Musk says the future system will run at: 150 mph. Still, it took only three minutes to go just over a mile from the beginning to the end of the tunnel, the same amount of time it took to accomplish a right-hand turn out of the parking lot and onto a surface street even before the height of Los Angeles' notorious rush-hour traffic.

This tunnel is an example of what Musk wants to build between the Loop and O'Hare Airport. That high-speed system would whisk riders from beneath Block 37 to O'Hare in 12 minutes at a cost of $20 to $25 per rider.

Musk visited the still unfinished transit terminal under Block 37 with Mayor Rahm Emanuel this summer.

"We were dropped down about 30 feet below grade in an elevator shaft about a quarter and a mile trip through a tunnel," he said.

Tuesday's reveal comes almost two years to the day since Musk announced on Twitter that "traffic is driving me nuts" and he was "going to build a tunnel boring machine and just start digging."

"I am actually going to do this," he added in response to initial skepticism, a Tweet that was blown up and posted near the entrance to the tunnel for Tuesday's event, along with other Musk tweets like, "Defeating traffic is the ultimate boss battle."

The tweets were a nod to Musk's sense of humor. Just after announcing he was creating a tunnel, he began The Boring Company, tongue in cheek intentional. Since his announcement, Musk has only revealed a handful of photos and videos of the tunnel's progress.

On Tuesday, he explained for the first time in minute detail just how the system, which he simply calls "loop," could work on a larger scale beneath cities across the globe. Autonomous, electric vehicles could be lowered into the system on wall-less elevators the size of two cars. Such elevators could be placed almost anywhere cars can go.

A number of autonomous cars would remain inside the system just for pedestrians and bicyclists. Once on the main arteries of the system, every car could run at top speed except when entering and exiting.

"It's much more like an underground highway than it is a subway," he said. "It's not like you're going through a whole series of stops. Nope, the main arteries will be going super fast, and it's only when you want to get off the loop system that you slow down."

Musk said he scrapped his previous plan to run the cars on platforms called skates. Instead, the cars would have to be fitted with specially designed side wheels that pop out perpendicular to the car's regular tires and run along the tunnel's track. The cost for such wheels would be about $200 or $300 a car, Musk said.

He said tunnels are the safest place to be in earthquakes — sort of like a submarine during a hurricane is safest beneath the surface — and addressed other concerns such as the noise and disruption of building the tunnels, which he completely dismissed. When workers bored through the end of the test tunnel, for instance, the people in the home 20 feet away "didn't even stop watching TV."

"The footsteps of someone walking past your house will be more noticeable than a tunnel being dug under your house," he said,

Musk said it took about $10 million to build the test tunnel, a far cry from the $1 billion per mile his company says most tunnels take to build.

Musk explained just how he's cutting costs. Measures include improving the speed of construction with smarter tools, eliminating middlemen, building more powerful boring machines, and instead of hauling out all the dirt being excavated, Musk is turning them into bricks and selling them for 10 cents.

He reiterated the simplicity of all his ideas.

"No Nobel Prize is needed here," he said. "It's very simple."

And he's not doing it for the money, he said, adding that it's for the greater good.

"Traffic is a blight on everyone's life in all cities," he said. "I really think this is incredibly profound. Hopefully that is coming across."

Steve Davis, head of The Boring Company, said the interest in the tunnel systems has been significant — anywhere from five to 20 calls a week from various municipalities and stakeholders.

One project Musk is planning on, known as the Dugout Loop, would take Los Angeles baseball fans to Dodger Stadium from one of three subway stations. Another would take travelers from downtown Chicago to O'Hare International Airport. Both projects are in the environmental review phase.

The Boring Company canceled its plans for another test tunnel on Los Angeles' west side last month after a neighborhood coalition filed a lawsuit expressing concerns about traffic and disruptions from trucks hauling out dirt during the boring process.

For the privately funded test tunnel, Musk acquired a tunnel-boring machine that had been used in a San Francisco Bay Area project and put it down a shaft in a parking lot at the SpaceX headquarters.

Already on Tuesday, Musk's representatives unveiled a new tunnel-boring machine they say they hope to have online soon, one that can bore four times faster than the one they've been using.

Musk's vision for the underground tunnels is not the same as another of his transportation concepts known as hyperloop. That would involve a network of nearly airless tubes that would speed special capsules over long distances at up to 750 mph, using a thin cushion of air, magnetism and solar power.

The loop system is designed for shorter routes that wouldn't require the elimination of air friction, according to The Boring Company.